Some prices are marked "P.O.A" - Price on Application. This
usually indicates that the item condition is unknown and will need to be tested
and inspected in more detail. Such items will be tested as far as possible before I
can give you a report on condition and price.

Aircraft
and General-purpose meters, panel meters and gauges.
Various
types available.
Old Circular Bakelite types to modern rectangular used and new.

This is an updated list of August 2018.

Moving Coil Direct Current meters
Micro-ammeters Milli-ammeters Ammeters
All are tested and will be checked again before dispatch and also cleaned-
photographs are mostly of instruments not yet cleaned!
Full scale ranges are approximate -within about 20% but mostly much better.
If shunts or
series resistors required to match the meter scale, these can often be supplied
at small or no extra cost.Dimensions are overall including bezel and
terminals. Further details or pictures on request.
Services types have a blue highlighted
background to the pictures.

NOTE - Sensitive (milli-amp and micro-amp) direct current meters can
be converted to voltmeters with suitable external resistors at no extra
cost.
They can mostly be converted to a.c. meters with
the addition of external components for 1 GBP extra.

Aircraft Pressure Indicator
Meter.
Moving Coil Scaled 0-120psi. 28V.
Sangamo Weston with 2 x 3.5k ohm coils. 270 degree scale.
60mm square flange with 47mm centres captive nuts. 70mm deep.
Unused from sealed boxes. These twin coil meters operate in a mode that does not rely on the spring
couple or voltage for accuracy. Terminal 1 is + supply, Terminals 3 and 4 are
normally connected to the ends of a 5k ohm sensing potentiometer whose wiper is connected to
the - supply. The potentiometer will then control the reading from zero to
full scale. Can also operate with a single variable resistor and a fixed
trimmer in the other arm. The system operates as low as 12 volts.